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freertos spinlock/portmux: Reduce spinlocking overhead

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Ref TW7117

Microbenchmarks in unit tests:

(All numbers in cycles per benchmarked operation):

Release mode
No lock contention lock/unlock -       301 -> 167 (-45%)
Recursive no contention lock/unlock -  289 -> 148 (-49%)
Lock contention two CPUs (lock/unlock) 699 -> 400 (-43%)

Debug mode
No lock contention lock/unlock -       355 -> 203 (-43%)
Recursive no contention lock/unlock -  345 -> 188 (-46%)
Lock contention two CPUs (lock/unlock) 761 -> 483 (-36%)
This commit is contained in:
Angus Gratton
2017-02-13 14:46:37 +11:00
committed by Angus Gratton
parent f2952de3a5
commit 4d42b2d100
6 changed files with 152 additions and 110 deletions
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15
components/freertos/include/freertos/FreeRTOS.h
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@@ -978,13 +978,14 @@ typedef struct xSTATIC_QUEUE
uint8_t ucDummy9;
#endif
struct {
volatile uint32_t ucDummy10;
#ifdef CONFIG_FREERTOS_PORTMUX_DEBUG
void *pvDummy8;
UBaseType_t uxDummy11;
#endif
} sDummy12;
struct {
volatile uint32_t ucDummy10;
uint32_t ucDummy11;
#ifdef CONFIG_FREERTOS_PORTMUX_DEBUG
void *pvDummy8;
UBaseType_t uxDummy12;
#endif
} sDummy1;
} StaticQueue_t;
typedef StaticQueue_t StaticSemaphore_t;